CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Net income	$ 699.7		$ 578.0		$ 513.4
Foreign currency translation adjustments	35.2	[1]	(48.7)	[1]	11.8	[1]
Cash flow and net investment hedges, net of tax:
Net unrealized losses on cash flow and net investment hedges	(2.3)	[2]	(0.6)	[2]	(3.1)	[2]
Reclassification of losses included in net income	2.4	[3]	3.2	[3]	3.8	[3]
Net change	0.1		2.6		0.7
Pension and Other Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income	5.9	[4]	4.4	[4]	2.9	[4]
Net actuarial losses and prior service costs	(14.8)	[5]	(34.2)	[5]	(7.3)	[5]
Net change	(8.9)		(29.8)		(4.4)
Comprehensive income	726.1		502.1		521.5
Less: comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interest	10.7		4.8		5.9
Comprehensive income attributable to Moody's	$ 715.4		$ 497.3		$ 515.6

[1] Amounts are net of income taxes of $0.2 million, $1.6 million and $11.7 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[2] Amounts are net of income taxes of $1.6 million, $0.4 million and $2.2 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[3] Amounts are net of income taxes of $1.7 million, $2.1 million and $2.6 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[4] Amounts are net of income taxes of $4.1 million, $3.0 million and $2.1 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[5] Amounts are net of income taxes of $11.2 million, $22.1 million and $5.2 million for the years ended December 31, 2012, 2011 and 2010, respectively.